Bmal 590 Questions and Answers

You take a random sample of 100 students at your university and find that their average GPA is 3.1. If you use this information to help you estimate the average GPA for all students at your university, then you are doing what branch of statistics? Inferential statistics

A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 200 sound cards represent a sample.

A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The five years represents a statistic.

A summary measure that is computed from a population is called a parameter.

Which of the following is a measure of the reliability of a statistical inference? A significance level.

The process of using sample statistics to draw conclusions about population parameters is called doing inferential statistics.

Which of the following represents a population, as opposed to a sample? All registered voters in the State of Michigan.

A study in under way to determine the average height of all 32,000 adult pine trees in a certain national forest. The heights of 500 randomly selected adult pine trees are measured and analyzed. The sample in this study is the 500 adult pine trees selected at random selected at random from this forest.

The significance level of a statistical inference measures the proportion of times a conclusion about a population will be wrong in the long run.

The confidence level of a statistical inference measures estimation procedure will be correct in the long run